Incandescent lamp



June 26. 1923.

L. RYZOWICZ ET AL INCANDESCENT LAMP Filed Aug. 6. 1920 In VEJZZHIS 400/5 RVZOI V/CZ M w W M 5% J m wm My Jfi Fatented June 26, N23.

' LOUIS BYZOWICZ AND JOHN J. BOLEK, F CLEVELAND, OHIO.

v Incannnscnn'r LAMP.

. Incandescent Lamps, of which the followin lit) lift

is a full, clear, and exact description re erence being had to the accompanying rawlngs.

This invention relates to improvements in incandescent electric lamps and has for its object the provision of means for prolonging the life of the lamp. Other objects include the provision of manually operable means adapted to cooperate with the means forprolonging the life of the lamp to minimize the possibility of displacement when in use; together with the provision of such an adjustable element that is simple, compact, capable of being cheaply manufactured.

and durable in use.

We accomplish the above object bypro viding a plurality of filaments, only one of which is adapted to be in operation at one time, and we provide means for selectively rendering ctive any desired filament.

The means for accomplishing the above and other objects will be more fully set forth in the following description which relates to the drawings, and the essential characteristics set forth in the claim.

In the drawings Fig. 1 is a longitudinal section thru the center of an incandescent lamp embodying the features of our invention; Fig. 2 1s a top view of the lamp; Fig. 3 is an enlarged, fragmentary section showing the means for retaining a movable contact arm in position; Fig. 4 is an alternate form of the mechanism shown in Fig. 3; F ig; 5 is a top View of the lamp shown in Fig. 4. The novel features embodied in our invention are applicable to the standard incandescent lamp, and as shown in Fi 1, represents the bulb of such a lamp aving a hollow stem 11 secured to the threaded base 12 and adapted to be inserted in a standard socket. Extending inwardly thru the base 12 and from the top portion thereof are theusual leading-in wires 13 and 14, which pass thru the stem and into the interior portion of the bulb, Secured to the lower end of the leading-1n wires, we pro vide the filaments 15 and 16, each having one end thereof secured to a common outlet wire 17, which also passes thru the stem and out at the metallic cap 18 on the base. The filaments 15 and 16 comprise standard material and our invention contemplates the use of only one filament as a lighting medlum at one time, and suitablemechanism on the base is employed to selectively render active either of the filamen The means for rendering active either filament is shown in Fig. 3 and comprises a contact arm 20, which may be constantly urged against the conductors at the base of grooves 21, or 22, by the spring 23 acting against piston 24 within the cylinder 25. The base 12 i preferably provided with a recess so that the cylinder 25 is closely fitted therein. The rod 26 may be rigidly secured to the piston 24 and be secured to'the arm 20 by any suitable means as, for example, by riveting. The contact arm v20 being at the top of the base constitutes one terminal and may be manually rotated about the shaft 26 to engage either of the conductors in tips grooves 21 and 22. The conducting grooves may provide a recess with in which the contact arm fits whereby it is securely held in position.

In Fig. 4 we have shown a modified form for constantly urging the contact arm within the conductor groove. This mechanism in brief comprises the contact arm 30 rigid with an internal cylinder 31 and slidably mounted in the cylinder 32, which like the cylinder 25 in Fig. 3 is adapted to be inserted within a. recess in the base 12. The shaft 33 may be rigidly secured to the cylinder 32 or be prevented from moving outwardly therefrom by the stop pin 34:, and may have the piston 35 rigid therewith. The spring 36 is preferably then used to conlid) =stantly urge the cylinder 31, and consequently the cylinder arm 30, downwardly within the. conductor grooves 21-22 attached to the leading-in wires 13 and 14. 11 As shown in the drawings, the lamp is set for a current to pass thru the filament 16 and the current flows thru the arm 20, conductor in groove 21, leading-in wire 15, outlet wire 17 and the metallic cap 18. Should thefilament 16 be broken, the lamp is removed from the socket and the contact arm 20 is rotated about the haft 26 until it engages conductor in groove 22. When the lamp is again inserted in the socket, the

path of the current is then thru the arm 20, conductor in groove 22, leading-in wire 13, filament 15, outlet wire 17 and cap 18.

From the foregoing description it will be seen that we have provided a device for selectively rendering active any one of a plurality of filaments within a lamp bulb; that we have so constructed this device that it is simple, positive in operation and adapted to be readily inserted within standard lamp bases.

Having thus described our invention, We claim:

An electric lamp having a bulb and a base therefor, said base comprisin a body of insulating material and a metallic ferrule embracing the insulation, there being a portion of said insulation protruding beyond one end of the ferrule and having a frusto-conme ias ical formation, spaced contact members embedded within the insulation on the side of the frusto-conical portion, and a revoluble contact arm having the axis thereof centrally positioned on the base, and having an inclined portion adapted to engage said contacts, said arm providing a contact button adjacent the axis of revolution thereof whereby contact may be made with a centrally disposed contact member in a lamp socket, a plurality of leading in wires passing through the base, each connected to. one of the contact members, and a common return wire passing also through the base and connected to the ferrule.

In testimony whereof we hereunto aiiix.

our signatures.

LOUIS RYZOWICZ. JOHN J. BOLEK. 

